4 Unified Communications Defined There are many definitions of Unified Communications but generally speaking it combines multiple real-time and offline communication modes (such as telephony, video, , fax, and instant messaging) plus a range of additional capabilities (including presence detection and click-to-call) into a single, integrated solution. With UC solutions, users can access and manage all of their communications tools from a single environment, regardless of their location. 4

8 Lync 2013 Architecture Roles Role Lync 2013 Lync 2013 Mediation Lync 2013 Edge Icon / Symbol Description The Lync Front End (FE) server is the main server that supports user registration, features and signalling between telephony devices such as handsets, Lync Clients and Mobile Lync Clients. The FE can be compared to the call processor in an IP PBX. Front End server functions include: Client registration and authentication, presence availability IM services including IM conferences (chat rooms) Audio / Video Conferencing, Web conferencing and app sharing Mediation server is implemented in order to support voice connectivity and conferencing as well as managing VoIP Codecs. Typically PSTN Trunks will be terminated by the VoIP Gateway and this will in turn be connected to the mediation server. Similarly, trunks will be terminated by an Session Border Controller (SBC) and this will in turn be connected to the mediation server. The role of the Edge is essential to provide connectivity between internal and external users or parties that may be outside of the corporate firewall. For example if one organisation wishes to federate services or IM to another external organisation, it is the role of the Edge to support this. 8

9 Lync 2013 Associated Roles Role Active Directory Reverse Proxy Exchange UM Icon / Symbol Description An Active Directory domain controller authenticates and authorizes all users and computers in a Windows domain type network assigning and enforcing security policies for all computers and installing or updating software. For example, when a user logs into a computer that is part of a Windows domain, Active Directory checks the submitted password and determines whether the user is a system administrator or normal user. Lync uses Active Directory to authenticate Lync users on the network. HTTPS reverse proxy in the perimeter network is required for external clients to access the Lync 2013 Web Services. Some of the features that require external access through a reverse proxy include the following: Enabling external users to download meeting content for your meetings. Accessing the Lync Web App client. Accessing the Dial-in Conferencing Settings webpage. Enabling mobile applications to automatically discover and use the mobility (Mcx) URLs from the Internet. Microsoft Exchange is for delivering s to users. The Unified Messaging option provides Voice Mail access to Lync users. Voice Mails are delivered as attachments to s. 9

10 Lync 2013 Associated Roles (cont.) Role Office Web Apps Icon / Symbol Description Office Web Apps is a new Office server product that delivers browser-based versions of Word, PowerPoint, Excel, and OneNote. A single Office Web Apps farm can support users who access Office files through SharePoint 2013, Lync 2013, Exchange 2013, shared folders, and websites. This is used by Lync 2013 to deliver Web based conferencing to participants. Survivable Branch Office 365 The Survivable Branch is an appliance built to increase voice resiliency in branch-office scenarios. It needs to run Windows 2012, a Lync 2013 Registration Service, and a Mediation role. For telecom access, either a VoIP gateway or a Session Border Controller must be provided. A Web-based version of Microsoft's Office suite of enterprise-grade applications. Office 365 is delivered to users through the cloud and includes Exchange Online for , SharePoint Online for collaboration, Lync Online for unified communications, and a suite of Office Web Apps, Web-based versions of the traditional Microsoft Office suite of applications. 10

36 Summary / Closing MS Lync is gaining market share but may be difficult to deploy Lync Express makes it easier and more cost-effective to deploy Lync with Enterprise Voice: Office 365 Branch office support PBX replacement Lync Express is the only Lync server appliance with a built-in VoIP gateway and SBC 36

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